I ordered my starter from Cultures for Health and it comes in a foil packet like you see here.
Here are the different types that I know about:
There are several online sources to obtain these starters, Cultures for Health is a good source because they carry all of the above and also many other great products like Kombucha and sourdough starters.
Keep in mind that you do not have to buy a yoghurt starter to make homemade yogurt. You can find a good quality yogurt to use as a "starter yogurt". Make sure has the "live and active cultures" seal. It must be plain yogurt. Flavored yogurt will not do. You can freeze your starter yogurt in ice cube trays so that it is convenient to have on hand.
To keep a pure starter, boil and cool milk to eliminate its natural bacteria and culture that milk with your starter on a weekly basis, then use a few tablespoons of the boiled milk starter in raw milk to culture raw milk yogurt.
So, if you are adhering to strict vegan standards you'll need to find a good source for a dairy free starter.
I recommend Tribest Yolife Yogurt Cultures. I've also heard good things about GI ProStart non-dairy yoghurt starter.
You can also buy a container of soy yogurt from the store and use it for your starter culture. Do make sure the kind of soy yogurt you buy at the store contains live and active cultures. I've seen a few brands that are heat-treated, which means the cultures are dead. Check for the seal (sorry if I sound like a broken record). Both Nancy's Cultured Soy and Whole Soy are good brands that use live vegan cultures. Just add about 1/2 cup of soy yogurt per 1/2 gallon of soymilk.
You will not need a yogurt maker to make any of these.
Caspian Sea yogurt (aka Matsoni) is sooo... good. It is more mild than yogurt and thinner. I use to make it, but I threw out the culture the last time we moved. I miss it!
Theoretically you only have to buy the culture once. As long as you take care of it you can use the same culture to make a lifetime supply of yogurt and then some. You can pass it on and give out to your friends. There is a blog I really enjoy called, The Nourished Kitchen where you can obtain cultures from other people. They have sort of a culture swap. I'd imagine the only cost is the shipping.
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